Isle Royale Rainfall Forecast

  • 45%
  • 5%
  • No Rain
  • No Rain
  • 25%
  • 40%
  • 30%
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  • Rainfall Probability Forecast NOAA

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Isle Royale Rainfall Statistics

September Rainfall

Copper Harbor (58.4 miles)

  • Total Rainfall September

    1.9in

  • Daily Average September

    0.2in

  • Wettest Day 9 September, 2025

    0.5in

  • Wet Days September

    8/13 (62%)

Climate (2010–Present)

Copper Harbor (58.4 miles)

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  • Annual Average 2020–2024

    26.8in

  • Monthly Average 2020–2025

    2.3in

  • Daily Average 2020–2025

    0.1in

  • Wettest Day 23 July, 2021

    2.7in
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